Spin-wave fluctuations in ferrimagnetic Mgx Fe3-x O4 nanoparticles
N/D
Tipo de produção
Artigo
Data de publicação
2010
Texto completo (DOI)
Periódico
Journal of Applied Physics
Editor
Texto completo na Scopus
Citações na Scopus
15
Autores
Franco A.
Zapf V.S.
Barbeta V.B.
Jardim R.F.
Orientadores
Resumo
We have performed a systematic study of the magnetic properties of a series of ferrimagnetic nanoparticles of Mgx Fe3-x O4 (0.8times;1.5) prepared by the combustion reaction method. The magnetization data can be well fitted by Bloch's law with T3/2. Bloch's constant B determined from the fitting procedure was found to increase with Mg content x from ∼3.09× 10-5 K-3/2 for x=0.8 to 6.27× 10-5 K-3/2 for x=1.5. The exchange integral JAB and the spin-wave stiffness constant D of Mgx Fe3-x O4 nanoparticles were also determined as ∼0.842 and 0.574 meV and 296 and 202 meV Å2 for specimens with x=0.8 and 1.5, respectively. These results are discussed in terms of cation redistribution among A and B sites on these nanostructured spinel ferrites. © 2010 American Institute of Physics.
Citação
FRANCO, A.; ZAPF, V. S.; Barbeta, V. B.; JARDIM, R. F.. Spin-wave fluctuations in ferrimagnetic Mg[sub x]Fe[sub 3−x]O[sub 4] nanoparticles. Journal of Applied Physics, v. 107, n. 7, p. 073904, 2010.
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Keywords
Assuntos Scopus
Bloch's law; Cation redistribution; Combustion reactions; Exchange integrals; Fitting procedure; Magnetization data; Mg content; Nano-structured; Spin-wave fluctuation; Spinel ferrites; Stiffness constants; Systematic study